radicale - a simple calendar server
       radicale [options]
       -h, --help
              show this help message and exit
       -d, --daemon
              launch as daemon
       -H HOST, --host=HOST
              set server hostname
       -p PORT, --port=PORT
              set server port
       -s, --ssl
              use SSL connection
       -k KEY, --key=KEY
              private key file
       -c CERTIFICATE, --certificate=CERTIFICATE
              certificate file